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CVE-2026-66369

6.5 · MEDIUM

The GOOSE parser contains an off-by-one boundary-handling flaw that can be triggered by a single unauthenticated Layer-2 multicast frame on the process bus.

Published Jul 30, 2026CWE-125EPSS 0.29%

Overview

CVE-2026-66369 is a medium-severity vulnerability. It was published on July 30, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The GOOSE parser contains an off-by-one boundary-handling flaw that can

be triggered by a single unauthenticated Layer-2 multicast frame on the

process bus. When specific GOOSE message fields are processed, the

parser advances its internal buffer position incorrectly, resulting in a

heap out-of-bounds read. On affected platforms, this condition reliably

terminates the subscriber process and causes a denial-of-service.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.jsonCISAwww.cisa.gov/news-events/ics-advisories/icsa-26-211-10

How CyberStrike helps

Frequently asked questions

What is CVE-2026-66369?

CVE-2026-66369 is a medium-severity vulnerability. It was published on July 30, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-66369?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-66369?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-66369?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-66369 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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